linux-kernel - Re: [PATCH 01/14] drm/mipi-dsi: Add a mipi_dsi_dcs_write

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Message-ID: <Y7MkzucDEdsYenqX@ravnborg.org>
Date:   Mon, 2 Jan 2023 19:39:10 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 01/14] drm/mipi-dsi: Add a mipi_dsi_dcs_write_seq() macro

Hi Javier.

On Wed, Dec 28, 2022 at 02:47:44AM +0100, Javier Martinez Canillas wrote:
> Many panel drivers define dsi_dcs_write_seq() and dsi_generic_write_seq()
> macros to send DCS commands and generic write packets respectively, with
> the payload specified as a list of parameters instead of using arrays.
> 
> There's already a macro for the former, introduced by commit 2a9e9daf75231
> ("drm/mipi-dsi: Introduce mipi_dsi_dcs_write_seq macro") so drivers can be
> changed to use that. But there isn't one yet for the latter, let's add it.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
>  include/drm/drm_mipi_dsi.h | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 20b21b577dea..c7c458131ba1 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -297,6 +297,22 @@ int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
>  int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
>  					u16 *brightness);
>  
> +/**
> + * mipi_dsi_generic_write - transmit data using a generic write packet
s/mipi_dsi_generic_write/mipi_dsi_generic_write_seq
(As the bot also reported)

with this fixed:
Reviewed-by: Sam Ravnborg <sam@...nborg.org>

> + * @dsi: DSI peripheral device
> + * @seq: buffer containing the payload
> + */
> +#define mipi_dsi_generic_write_seq(dsi, seq...) do {				\
> +		static const u8 d[] = { seq };					\
> +		struct device *dev = &dsi->dev;	\
> +		int ret;						\
> +		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));	\
> +		if (ret < 0) {						\
> +			dev_err_ratelimited(dev, "transmit data failed: %d\n", ret); \
> +			return ret;						\
> +		}						\
> +	} while (0)
> +
(If you align '\' under each other it would be nicer, but I could see
that mipi_dsi_dcs_write_seq() do not do so).
>  /**
>   * mipi_dsi_dcs_write_seq - transmit a DCS command with payload
>   * @dsi: DSI peripheral device
> -- 
> 2.38.1